When Vilks entered a classroom where he was to deliver a lecture to about 250 people — all of whom had passed through a security checkpoint to gain admission — about five people started protesting loudly, Eronen said.

After Uppsala uniformed and non-uniformed police calmed the protesters, the lecture got under way at about 5:15 p.m. (11:15 a.m. ET), Eronen said.

But as Vilks was showing audiovisual material, 15 to 20 audience members became loud and tried to attack Vilks, he said.

As police stepped in, a commotion started and Vilks was taken to a nearby room; police used pepper spray and batons to fend off the protesters, Eronen said. Vilks did not return to the lecture. [Video footage of the event].

Last March, an American woman who called herself “Jihad Jane,” Colleen LaRose, was indicted in the United States for allegedly conspiring to support terrorists and kill Vilks.